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  2. Prepaid envelopes, also called "business reply mail," are tools businesses use to encourage customers to return information, like credit card applications. All the customer has to do is drop the pre-addressed, postage-paid envelope into the mail, and the mail is delivered to the company.
    smallbusiness.chron.com/prepaid-postage-work-17…
    Prepaid postage envelopes work by affixing precanceled stamps by getting a permit and buying these stamps in bulk for a discount. You can also use metered postage or permit imprints to pay for your postage in advance.
    www.postgrid.com/how-do-prepaid-postage-envelo…
     
  3. Prepaid Priority Mail | Envelopes | USPS.com